The most I spent in one go was buying an Ellsworth Epiphany frame (one of the early ones) and swapping the bits from a Cove Stiffee.
Took a while to admit it, but that Epiphany was crap.
It’s put me off buying expensive stuff.
My MTB is now a Saracen Kili Flyer, a warranty replacement for one of those 350 Genesis Grapil.
Part of me enjoys seeking out these kind of bargains.
I’d never spend 1000’s now. All i do is cycle around in circles for a bit of fun! Tried road racing, and even there I think a cheap bike is better given the number of crashes.